Earlier quoted context omitted.
God, Rothkos... nobody has ever been able to explain why I should care about him or his fuzzy rectangles. And I was engaged to an artist that loved him...
If you have not seen a Rothko in person, you may want to postpone judgment a bit. I've known a few people who have independently told me that they didn't get Rothko until they went to a museum with his work.
Pollock's paintings at least have a sense of dynamism and there are interesting interactions in the paint. DeKooning has a sense of dynamism, but so did most classical artists with a bunch of other benefits to boot. Frankenthaler/Kline/Twombly all had one move they repeated for decades. Rauschenberg and Johns predicted a lot of modern graphic design, but you'll find more interesting visuals in an issue of Lucky Peach. Diebenkorn made an attempt to add the rudiments of representation.
Modern art is endlessly interesting. There are personal dramas, changes in cultural norms, and financial stories that are much more compelling than anything on the canvas. AbEx stuff is fine, but you'll find equally compelling designs on bedding at Target.